Wait Activity not waking-up on time

Hi,
We have several flows that utilise Wait Activities to wait until a specific time. Occassionally we have noticed that the flow remains within the Wait Activity after the wait time has passed.
A specific example occurred today where at "2009/10/20 09:06:25" the Wait started with expiry time of "2009/10/20 11:47:55" - it is now 20/10/09 12:16:26, and flow is still within the wait. Given enough time I know the flow will awake, but I am unsure how to investigate the cause.
we on BPEL version 10.1.3.1.
Thanks - Anit

Anit, This might have been happening because of heavy load on bpel server. Pls refer to metalink doc ID 561172.1

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Parse       36      0.43       0.51          0          5          0           0
Execute     62      0.01       0.01          0          0          0           0
Fetch      579      4.01      49.06       3027     153553          0        5516
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SQL*Net message to client                   32754        0.00          0.03
SQL*Net message from client                 32753        2.33        232.01
Disk file operations I/O                      179        0.00          0.02
db file sequential read                      2979        0.54         45.72
SQL*Net more data to client                133563        0.04          5.30
direct path read                            34840        0.94        268.21
SQL*Net more data from client                1075        0.00          0.02
db file scattered read                          6        0.03          0.11
asynch descriptor resize                       52        0.00          0.00
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call     count       cpu    elapsed       disk      query    current        rows
Parse       25      0.00       0.02          0          0          0           0
Execute     58      0.05       0.04          0          0          0           0
Fetch      126      0.00       0.04          4        161          0         123
total      209      0.05       0.11          4        161          0         123
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Misses in library cache during execute: 3
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Disk file operations I/O                        1        0.00          0.00
db file sequential read                         4        0.01          0.03
asynch descriptor resize                        1        0.00          0.00
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Trace file compatibility: 11.1.0.7
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Christophe Lize wrote:
Closing this thread even if it's not answered...Sorry, I don't have time to test this myself now, but you shouldn't mark this thread as answered if it is not, because other people might find it and think they find an answer if they have a similar question.
I suggest you try the following to narrow down things:
1. Open the RAW trace file and check the cursor numbers of the "direct path reads" - check if you can find any references for those cursor numbers manually. The cursor numbers are those numbers behind the WAIT #<xx>, and you can check if you find any other entry unequal to WAIT #<xx> with the same #<xx>, for example EXEC #<xx> or FETCH #<xx>
A short primer on how to interpret the raw trace file can also be found in MOS document 39817.1
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Regards,
Randolf
Oracle related stuff blog:
http://oracle-randolf.blogspot.com/
Co-author of the "OakTable Expert Oracle Practices" book:
http://www.apress.com/book/view/1430226684
http://www.amazon.com/Expert-Oracle-Practices-Database-Administration/dp/1430226684

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Wait Activity not waking-up on time

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